linux-kernel - [PATCH v6 09/19] gfs2: Remove redundant check from gfs2_glock

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Message-Id: <20210819194102.1491495-10-agruenba@redhat.com>
Date:   Thu, 19 Aug 2021 21:40:52 +0200
From:   Andreas Gruenbacher <agruenba@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        "Darrick J. Wong" <djwong@...nel.org>
Cc:     Jan Kara <jack@...e.cz>, Matthew Wilcox <willy@...radead.org>,
        cluster-devel@...hat.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, ocfs2-devel@....oracle.com,
        Bob Peterson <rpeterso@...hat.com>
Subject: [PATCH v6 09/19] gfs2: Remove redundant check from gfs2_glock_dq

From: Bob Peterson <rpeterso@...hat.com>

In function gfs2_glock_dq, it checks to see if this is the fast path.
Before this patch, it checked both "find_first_holder(gl) == NULL" and
list_empty(&gl->gl_holders), which is redundant. If gl_holders is empty
then find_first_holder must return NULL. This patch removes the
redundancy.

Signed-off-by: Bob Peterson <rpeterso@...hat.com>
---
 fs/gfs2/glock.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index fd280b6c37ce..f24db2ececfb 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1514,12 +1514,11 @@ void gfs2_glock_dq(struct gfs2_holder *gh)
 
 	list_del_init(&gh->gh_list);
 	clear_bit(HIF_HOLDER, &gh->gh_iflags);
-	if (find_first_holder(gl) == NULL) {
-		if (list_empty(&gl->gl_holders) &&
-		    !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
-		    !test_bit(GLF_DEMOTE, &gl->gl_flags))
-			fast_path = 1;
-	}
+	if (list_empty(&gl->gl_holders) &&
+	    !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
+	    !test_bit(GLF_DEMOTE, &gl->gl_flags))
+		fast_path = 1;
+
 	if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl))
 		gfs2_glock_add_to_lru(gl);
 
-- 
2.26.3